# Simplex Nodal vs Lume Test

The clearest difference is in-app purchases: Simplex Nodal at none against Lume Test's 8. Simplex Nodal also leads on iOS requirement (9.0 vs 15.1). Lume Test's advantage is update cadence (every 2 weeks vs every 4 months). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Lume Test sells 8 one-off in-app purchases. Simplex Nodal asks for nothing beyond the download.

Simplex Nodal ships an update every 4 months, Lume Test every 2 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Simplex Nodal | Lume Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lume-test/id6670309775/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 14 MB | 115 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Simplex Nodal Limited](https://appshunter.io/developer/995736552) | [LUME EDUCATION GROUP PTY LTD](https://appshunter.io/developer/1764668269) |

## What reviewers say

### Simplex Nodal

[App page](https://appshunter.io/ios/app/simplex-nodal/id995736553)

Explore electricity markets by building and solving your own models. This app visually demonstrates complex concepts like locational marginal pricing, line losses, and the simplex algorithm. Learn through interactive examples and detailed step-by-step operations.

**Highlights:** Build and solve electricity market models, Visualize simplex algorithm workings, Explore locational marginal pricing, Understand line losses and binding constraints, Step-by-step simplex iteration details, Export simplex tableaux as CSV, Includes sample market models

**In-app purchases:** none


### Lume Test

[App page](https://appshunter.io/ios/app/lume-test/id6670309775)

Prepare for English proficiency tests like PTE Academic, TOEIC, and IELTS with AI-powered feedback on speaking and writing. Track your progress with detailed analytics and personalized study plans to accelerate your learning.

**Highlights:** AI-powered speaking assessment, Professional essay marking, Grammar and spelling correction, Reading and listening practice tests, Scored practice tests, Detailed performance analytics, Custom study planner

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PTE Academic: 30 Days | $19.00 | one-time |
| PTE Core: 30 Days | $19.00 | one-time |
| PTE Academic: 60 Days | $29.00 | one-time |
| PTE Core: 60 Days | $29.00 | one-time |
| PTE Academic: 90 Days | $39.00 | one-time |
| PTE Core: 30 Days | $39.00 | one-time |
| PTE Academic: 180 Days | $69.00 | one-time |
| PTE Core: 180 Days | $69.00 | one-time |


## Frequently asked questions

### Is Simplex Nodal free?

Simplex Nodal is free to download, with no in-app purchases.

### Is Lume Test free?

Lume Test is free to download, with in-app purchases available.

### Do Simplex Nodal or Lume Test have ads?

Neither Simplex Nodal nor Lume Test shows ads.

### Which is updated more often, Simplex Nodal or Lume Test?

Simplex Nodal ships an update every 4 months, and Lume Test every 2 weeks. Most recently, Simplex Nodal was updated on November 1, 2026 and Lume Test on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*